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Inner ear: The inner ear consists of the cochlea and vestibular apparatus. The cochlea is a component of. osseous labyrinth that contains perilymph and the cochlear duct. The cochlear duct is a component of. membranous labyrinth and contains endolymph. The cochlea makes 3.25 turns in the dog (2.5 in man) around. a core of bone (called the modiolus) through which the cochlear nerve. passes. The entire complex resembles a snailâs shell (whence the term. cochlea is derived).
All the valves are trileaflet, with the exemption of the mitral valve, which has two leaflets. All four cardiac valves are surrounded by fibrous tissue forming partial or complete valvular rings, or annuli. These annuli join the fibrous skeleton of the heart to support and anchor the valvular structures.The aortic valve is situated between the left ventricular outflow tract and the ascending aorta.he normal human heart contains four valves that regulate blood flow into and out of the heart. The aortic and pulmonic valves are identified as the semilunar valves, whereas the tricuspid and mitral valves are referred to as the atrioventricular valves.